Turnek whitehouse



AM. PHOTO-LITHO. CILNM SSSSSSSSSSSSSSSS $1 TURNER VHITEHOUSE, OF BOSTON,MASSACHUSETTS. D

CONSTRUCTION 0F DOOR-LOCKS.

To all whom t may concern:

Be it known that I, TURNER VHITEHOUSE, of Boston, in the county ofSuffolk and State of Massachusetts, have invented a new and useful Modeof Preventing Friction and Wear in Door-Locks, called Turner WhitehousesImproved Door-Lock, of which the following is a true and exactdescription.

The nature of my invention consists in adapting certain parts of thecommon lock for the reception of friction wheels, and for theapplication of the same, which I apply in the following manner. Havingmade the box in the common form and placed therein the wards and keyfitted to them, I proceed to form and adapt the lock-bolt. This I formby making the shaft, about one fourth as thick as its head, which slidesthrough the front plate, by taking oif a part of the shaft on each,side; but more from the under side than from the upper side; as may beseen, marked, A, in Plate 1, Figures 5 and 6. Also Plate 2, Fig. 1. ThusI furnish a space between the shaft of the lock-bolt and the under plateof the lock for the reception of the dog F, and its friction wheel, C,which I swivel on the dog, by the pin, K; and in such a position thatthe key, a, may play against its periphery, while raising the dog tounfix the lock bolt, instead of rubbing against the dog itself. (Vide P.1, Figs. 5 and 6.) I also furnish another space between the upper sideof the shaft of the lock bolt and the upper lock plate, for the purposeof accommodating two friction wheels, (marked D, and 12,) which I swivelon the upper side of the shaft of the lockbolt, in such a position asthat the key plays between them, alternately escaping the periphery ofthe other while locking or unlocking; and therefore moves with much morefreedom and ease than when it rubs against the lock bolt itself. (VideP. 1, Fig. 5, and P. 2 Fig. 1.)

I make a mortise either through or a part way through the shaft of thelock bolt, near to the end, and longitudinally fitted to slide on ashort stud standing fast and perpendicularly in the lock plate. (MarkedN. P. 1,

Figs. 5 and 6.) In the edge of the shaft of the lockbolt I out twonitches, a little deeper than a half round, whose distance from eachother is equal to the distance the lock bolt slides in locking andunlocking. These nitches alternately receive the neck of the pin, vK,fixing the lock bolt whether locked or unlocked. (Vide P. 1, F. 5.)After the dog has been raised (as in Fig. 5,) itis forced down again byVa longitudinal spring, (marked L Thisy spring acts on the periphery oft e friction wheel, O, as in Figs. 5 and G. There are two more frictionwheels (P, P,) so adapted as to free the tumbler Gr, from friction.(Vide P. 2, Fig. 1.)

The latch bolt, R, is made narrower at that part where the appendage ofthe tumbler plays over it, and is bent at right angles, forming a foot,Q, about an inch long, and

slides on the lower plate of the lock, directlv behind the tumbler; andits shaft is parallevl` with the shaft of the lock bolt. There is afriction wheel, S, swiveled upon the foot of the latch bolt in such amanner that its pe- Y riphery bears against the center of the appendagesof the tumbler.v The face of the appendages is excavated. Thisexcavation is marked, z'; it is for the friction wheel to rest in, andaords two bearings for it. (Vide Plates 1 and 2, Figs. 2, 3, and 4.)This friction wheel, S, revolves on the pin, T, on the neck ofwhich isswiveled one end of a small connecting arm V,-the other end of which armis swiveled on another pin, U, fixed in the shaft of the lock boltnearthe back end. (Vide P. 2, Fig. l.) Because the end of the lock boltslides steadily on the above mentioned pin, or stud, N, the arm Vaffords a guide for the direction of the back end of the latch bolt.(Vide P. 2 Fig. 1 and P. 1 F. 2 dotted lines.)

The latch bolt is forced out through the face of the lock by the spring,W, which acts against the friction wheel, X, swiveled near the end ofthe short arm, little w. This arm is swiveled on a pin a little back ofthe friction wheel, thence extending forward to the foot of the latchbolt, it receives the friction Y wheel, ZV, which plays against the footof the latch bolt and forces it out. (Vide P. 1, Fig. 2.)

.aan Aram joFFicE. i

What I claim as my invention and improvement, and desireto secure byLetters` Patent, is-

The application of the several friction Wheels, and the adaptation ofthe Various Aence of the Witnesses Whose names are hereparts of the 100kfor the reception of the unto subscribed, on the 21st day of Augt.friction Wheels as represented in my draw- A. D. 1837.

ings, and referred to in my specieation. TURNER WHITEHOUSE. 5 Intestimony 'that the above is a true speci- Witnesses:

oation of my invention and improvement, AUGUSTUS PEABODY,`

I here unto subscribe my name in the pres- JOHN DWIGHT.

